三州礦區
USA
橫跨密蘇里、堪薩斯與奧克拉荷馬三州的三州礦區(喬普林–皮徹地區),曾是世界重要的鉛鋅礦帶,在收藏界以大型光亮方鉛礦立方體與琥珀色『紅寶石傑克』閃鋅礦聞名。
A classic Mississippi-Valley-type lead–zinc field
The Tri-State district, centred on Joplin, Missouri and Picher, Oklahoma, was a major lead and zinc producer into the 20th century. Its Mississippi-Valley-type ore bodies, hosted in cherty limestone, yielded exceptionally well-crystallised sulfides and carbonates.
What collectors look for
Sharp, bright galena cubes and cubo-octahedra, gemmy amber-to-red "ruby jack" sphalerite, and associated calcite, dolomite, chalcopyrite, and marcasite are the signature Tri-State specimens.